Hey /vp/. I traded someone a friend safari spiritomb and they gave me a charizarditeX. I have X version, so I have an extra megastone. I want to use it to get a Y version exclusive mega stone, but I haven't decided on which one to trade for yet.

So I want to ask your opinion. what do you think is the best Y exclusive mega?

Right now I'm leaning towards Charizard Y, Mewtwo Y or Houndoom.